/* 
 * Copyright (C) 2022 Leah Rowe <info@minifree.org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include "../include/lib/checksum.h"

int validChecksumInPart(uint8_t** buffer, uint8_t part)
{
	uint16_t total = 0;
	for(uint16_t i=0; i<=0x3F; i++)
		total += word(buffer, i, part);

	if (total != 0xBABA) return 0;
	else return 1;
}

void setChecksumInPart(uint8_t** buffer, uint8_t part)
{
	uint16_t total = 0;
	for (uint16_t i=0; i<0x3F; i++)
		total += word(buffer, i, part);

	setWord(buffer, 0x3F, part, 0xBABA - total);
}
